This is a function of your ISP. Look, ask there.
My ISP offers this and it requires a cgi-bin folder, a htpasswd within and a
htaccess file within the protected folder.
Visit here to see how it is done on Infinity Internet ISP site.
https://support.iinet.com/answer.html?ost=General&osv=0&category=ftp&topic=htpasswd

Signature
Don
Vancouver USA
> Hi
>
[quoted text clipped - 4 lines]
>
> Thx françois
Just FYI, Don's reply is in reference to being hosted on the Apache server,
Unix platform. If you are hosted on a Windows Server you can restrict access
thru subweb permissions using FrontPage Server Extensions.
In addition, separate from both of these, most hosts offer a "control panel"
web page that typically supports applying permissions on directories of your
site.

Signature
David Bartosik - [MSFT MVP]
http://www.publishermvps.com
http://www.davidbartosik.com
> Hi
>
[quoted text clipped - 4 lines]
>
> Thx françois
Don Schmidt - 10 Jan 2006 19:30 GMT
David,
Thanks for shedding some light into this ol folk's brain. I fall into the
class, "know just enough to be dangerous" <G>
Don
> Just FYI, Don's reply is in reference to being hosted on the Apache
> server,
[quoted text clipped - 15 lines]
>>
>> Thx françois